Synthesis of titania composite membranes by the pressurized sol-gel technique
- Yonsei Univ., Seoul (Korea, Republic of)
Crack-free titania composite membranes have been synthesized from colloidal titania sols (average particle size of 7--16 nm) by the pressurized sol-gel coating technique. The Knudsen permeability of N{sub 2} through the titania membrane layer heat-treated at 300 C is about 21 {times} 10{sup {minus}7}--35 {times} 10{sup {minus}7} mol/m{sup 2} {center_dot} s {center_dot} Pa at room temperature. The permselectivity and the separation factor of He to O{sub 2} in the temperature range of 25--245 C are 2.49--2.74 and 1.66--1.84, respectively. The average pore diameters of these membranes estimated from the molecular weight cutoff data (6,000--9,000) using poly(ethylene glycol) are 3.0--4.0 nm. By doping zirconia into titania membranes, their thermal stability could be improved up to 800 C.
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 203558
- Journal Information:
- Journal of the American Ceramic Society, Journal Name: Journal of the American Ceramic Society Journal Issue: 1 Vol. 79; ISSN 0002-7820; ISSN JACTAW
- Country of Publication:
- United States
- Language:
- English
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